Nsg 3500 - Exam 1 Questions And Correct Answers | Verified |latest Update

5. The nurse teaches a class that which of the following is the first gender change to occur in the embryo? A. Destruction of the "Y" chromosome in the female embryo B. Development of dominance in the primitive duct structure C. Formation of primitive external genitalia that are visible on ultrasound D. Spermatogenesis and oogenesis in male and female embryos, respectively {Ans: ANS: B Differing male/female developmental changes in the mesonephric and paramesonephric ducts include the development of dominance in one set of the ducts. Mesonephric ducts become dominant in males; paramesonephric ducts become dominant in females. This is the first gender change that occurs. Gender is determined by the presence of an XX or XY pair of chromosomes; none are destroyed. External genitalia are usually not visible before 12 weeks of gestation, when androgens begin to stimulate their growth. Spermatogenesis occurs in puberty in boys; oogenesis begins sometime after 10 weeks of gestation when the ovaries begin to develop.}5. A 14-year-old girl asks the school nurse why her periods are so irregular. What is the best response by the nurse? A. "All young girls have irregular periods "Don't worry; this is totally normal." C. "Estrogen levels are still